I've tried reading lights, but they didn't have the spread for a page of music.
Look into the GigLight, by
LampCraft. It's an bright LED light that is advertised to illuminate a two-page score, but it can cover four pages in a pinch. They have higher-end models, as well.
Battery-operated, or you can get a wall wart for it. See also the Super GigLight; supposed to be four times brighter.
I'm happy with mine.
Michael